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(No Model.) 2 Sheets-Sheet 1.

A.STETTNER,J1:; ADDING MAGHINE.

No. 277,627. Patented May 15,1883.

N l WITNESSES: 7' 7 INVENTOR-z k Fq E S L a. Kr S H BYKL) 7 7 ATTORNEYS,

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(N0 Model.) 2 Sheets-Sheet 2.

A. STETTNER, Jr.

ADDING MACHINE No. 277,627. Patented May 15,1883.

WITNESSES I tudinally on the said shaft.

UNITED STATES PATENT OFFICE.

v ALBERT STETTNER, JR,

OF BERLIN, GERMANY.

ADDING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 277,627, dated May 15,1883. Application filed March .2, 1883. (No model.)

.To all whom it may concern:

Be it known that I, ALBERT STETTNER, Jr., of Berlin, Germany, haveinvented a new and improved Adding-Machine, of which the following is afull, clear, and exact description.

rods are provided with tappets acting on pro-- [5 jections on a shaftprovided at the end with a segmental rack, engaging with anothersegmental rack made integral with an arm loosely mounted on the shaft,and provided with a pawl engaging with the teeth of a ratchetwheelrigidly 1nom1tcd on the end of the shaft.

The invention further consists in a shaft provided with projectionsextending below the key-rods, and at the end with an arm having a toothwhich passes in between studs on the ratchet-wheel, for the purpose ofpreventing the ratchet-wheel from being rotated too far.

The invention also consists in'various parts and details, andcombinations of the same, as will be fullyset forth and describedhereinafter.

Reference is to be had to the accompanying drawings, forming part ofthis specification, in

which. similar letters of reference indicate corresponding parts in allthe figures.

Figure 1 is a longitudinalclevation of my improved adding-machine, thecasing being shown in section. Fig. 2 is an end elevation of the same,the casing being removed. Fig. 3 is a cross-sectional elevation of thesame. Fig. 4 is a cross-sectional elevation of the shaft, showing thevarious positions of the arms of the same.

A shaft, A, isjournaled horizontally in a suitable frame, and is eithersquared between the ends or provided with longitudinal ribs, so that thecylinder B, mounted on the said shaft, will turn with the same, but canslide longi- The cylinder B is provided with a spiral groove, 0, and onthe ridges between the grooves the numbers from 1 to 1,000 are produced,the numbers beginning at one end of the cylinder and running spirallyaround the same. A blade, l), attached to the base of the machine,passes into the spiral groove 0, so that when the shaft A rotates thecylinder B the action of the blade D in the spiral groove O causes amovement of the cylinder O'iu one direction or the other, according tothe direction in which the shaft is turned. v

On one end of the shaft A a ratchet-wheel, E, is rigidly mounted,.andadjoining the said ratchet-wheel an arm,F,is loosely mounted on thecylindrical part of the shaft A,with which arm F a segmental rack, G, ismade integral. A pawl, H, pivoted to the outer end of the arm F, engageswith the teeth of the wheel E. A segmental rack, J, is mounted rigidlyon the end of a shaft, K, parallel with, in front of, and slightly belowthe shaft A.

On the end of the shaft K an arm, L, is mounted, which is provided witha pawl, L,

adapted to engage with the teeth of the wheel E, which arm L is alsoprovided with a handle, L Nine key-rods, M, are held in a row and tomove vertically in the front part of theframe of the machine, and arepressed upward by springs N, surrounding rods 0, which pass through thelower rectangular bent ends of the said key-rods. The key-rods areprovidedwith the numbers from 1 to 9. Each key-rod M is provided with atappet, 1 adapted to engage with a corresponding projection, Q, on theshaft K.

Below the shaft K, and parallel therewith, a shaft, R, is journaled,which is provided with as many arms as there are key-rods M, which armsS extend under the lower ends of the key-rods. At the end the shaft R isprovided with a long arm, T, provided with a weight, T, at the upperend, and'with an upwardlyprojecting tooth, V, which is adapted to passbetween studs WV, projecting from the outer surface of the wheel E,which studs are arranged in a circle along the edge of the said wheel.The casing U, surrounding the machine, is provided in its top with anopening,

Y, through which the numbers on the cylinder have been swnngdownward,the spring a turns the shaft K in such a manner that the projectionswill swing upward again. The length of the projections Q and theirinclinations to the shaft K are arranged as shown in Fig. 4that is, theyhave nine different positions-and are so arranged as to describedifferent arcs, according to the numbers they representthat is to say,the arm or projection Q, that is depressed by the keymod 1 describes avery small arc, and the projection Q that is depressed by the key-rod 9describes an are which is nine times longer, and so on.

The operation is as follows: The cylinder B is so adjusted that the zerowill show in the opening Y. Then the operator begins to add bydepressing the keys corresponding to the numbers that he wishes to add,and after he has added the numbers he reads off the result by lookinginto the opening Y. If one of the key-rods M is depressed, itsprojection or tappet I strikes the corresponding projection, Q, of theshaft K and turns the said shaft and the segmental rack J. As the saidsegmental rack engages with the segmental rack G the arm F will be swungin the direction of the.

arrow to, and the pawl H, engaging with the teeth of the wheel ID,swings the said wheel in the same direction. The wheel ismovedin thedirection of the arrow a a greater or less distance, according as theshaft K has been revolved a greater or less distance, and this distanceagain depends on the key-rod that has been depressed, for, as has beenstated above, the key-rods representing the higher numbers are depresseda greater distance than those representing the lower numbers. That thecylinder shall not be rotated too far in case the key-rods are depressedtoo suddenly, I have provided the check-lever '1, so that the key-rods Mcan strike the corresponding projections, S, on the shaft 1%, and thusthrow the inner end of the arm T upward, causing the tooth V to passupward and in between the studs \V, thereby arresting wheel E. After thenumbers have been added, the cylinder B must be turned backward again,so that its zero will be under the opening Y, and to permit this thepawl II must be disengaged from the teeth of the wheel E. This isaccomplished by swinging the arm L in the direction of the arrow 1),whereby it strikes against the stud d on the pawl II and disengages thesame, and then the shaft A can be turned in the inverse direction bymeans of the key Z. The pawl L checks the wheel E and prevents it frombeing rotated backward when the racks G J swing downward.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In an adding-machine, the combination, wi h a spirallygroovedcylinder adapted to move longitudinally on its shaft, of a ratchet wheelmounted rigidly on the end of the shaft, a blade working in the grooveof the cylinder, an arm mounted loosely on the end of the shaft, andprovided with a pawl for engaging with the ratchet-wheel and with asegmental rack, a second segmental rack engaging with theabove-mentioned segmental rack, and mounted on the end of a shaftprovided with a series of segmental projections, and of nine key-rodsprovided with tappets for striking against the projections of the lastabove'mentioned shaft, and thereby swinging the segmental racks and thearm with a pawl and turning the grooved cylinder, substantially asherein shown and described, and for the purpose set forth.

2. In an adding-machine, the combination, with the grooved cylinder 13,mounted on the shaft A, and the blade I), of the ratchet-wheel E, thearm F, provided with the pawl II and the segmental rack G, the rack J,engaging with the rack *r, the shaft K, provided with the projections Q,the key-rods M, provided with the tappets P, the guide-rods O, and thesprings N, substantially as herein shown and described, and for thepurpose set forth.

3. In an adding-machine, the combination, with the grooved cylinder 1-3,mounted on the shaft A, and theblade I), of the ratchet-wheel E, the armF, provided with a pawl, II, and a segmental rack, G, the rack J,engaging with the rack G, the shaft K, provided with the projections (Q,the key-rods M, provided with the tappets 1, and the arm L, providedwith the pawl L, substantially as herein shown and described, and forthe purpose set forth.

4. In an adding-machine, the combination,

with the grooved cylinder B, mounted on the shaft A, and the blade D, ofthe ratchet-wheel E, the arm F, )rovided with the pawl II, the stud d,the segmental racks (.land J, the shaft K, provided with projections Q,the key-rods M, provided with the tappets P, the arm L,

provided with the pawl L, and the handle L", substantially as hereinshown and described, and for the purposes set forth.

5. In an adding-machine, the combination, with the spirally-groovedcylinder B, mounted on the shaft A, and the blade D, of the ratchetwheelE, the arm F, provided with the pawl H, the segmental racks G and J, theshaft K, provided with projections Q, the key-rods M, provided withtappets I, the shaft R, provided with projections S, the arm T, thetooth V, and the studs N, projecting from the wheel E, substantially asherein shown and described, and for the purpose set forth.

Signed at the city of Berlin, Prussia, this 5th January, A. I). 1883.

ALB. S'IET'TNE 1, JR. Vitnesses:

B. ROI, Gnonc HABEnKonm

